Not trying to be picky but people are bandying the name 'polyplastics'. This is the trade name of a chemical Company that supplies various plastic and resin type materials including acrylic used for caravan windows. There is also a Company based in Holland which uses polyplastic as part of its commercial name and is a supplier of acrylic windows to many caravan and motorhome manufacturers in Europe. There is also a UK based Company that does a similar function here. They are both authorised to use the technical name 'polyplastic' for the material used in their products. One caravan/motorhome manufacturer in Europe has accepted there is a potential problem with the windows supplied by the Dutch Company over a very long period of time, and as a result it has initiated a recall programme with a number of solutions offered. Full cost paid replacement is not one of them. As many owners feel that if their windows are potentially substandard, these should be replaced free of charge and this has lead to the potential litigation issue, and a class action is being considered. As the MOds have mentioned that is outside the remit of this Forum.
If a UK Company is accepting that faults in supplied windows are suitable for full re-imbursement, that is fine, just as long as the 2 issues do not get blurred, which I suspect is likely to be the case. It could be just coincidence that 2 issues involving windows made from the same material have arisen at the same time. Again. I would stress that as far as I can ascertain, it is not the window material itself that is being questioned in either case, merely the assembly process.
All I would suggest is that anyone who feels there is a problem with their windows, starts with the supplying dealer and works through that chain of responsibility. My main point was that people sometimes have a habit of putting 2 and 2 together and often getting 5.